explanation for classname<C> is not clear.

[yinping4256]

Please complete the information below:

Where is the problem?

https://docs.hhvm.com/hack/built-in-types/classname

• • • eg "The section describing how widgets work" - - -

What is the problem?

It lacks examples for how to use it. class C1 { ... } class C2 { public static classname<C1> $p1 = C1::class; public static function f(?classname<C1> $p): classname<C1> { ... } public static vec<classname<C1>> $p2 = vec[C1::class];}

this code does not make sense for a noob. more explanations are needed. For example, what exactly does "classname<C1>" mean? What is the difference between "classname<C1>" and "classname<C2>"??

• • • eg "It doesn't explain that widgets are singletons" - - -

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Please don't change anything below this point.

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• Build ID: HHVM=HHVM-4.57.0:HSL=v4.41.0:2020-05-21T18:29:34+0000:422a1f74d5f744078d1a5aba910cd7ced3e6f419
• Page requested: /hack/expressions-and-operators/new
• Page requested at: Thu, 25 Jun 2020 08:21:55 +0000
• Controller: GuidePageController